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Why is it important that you always install a USB device s driver before you physically install the USB device John encounters a system with a Bluetooth USB device installed, and the user is complaining that many of the features that should be included with this device don t seem to exist What does he need to do to x this problem
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224 14: Input/Output
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Beth s brand-new USB keyboard has a piece of the packaging stuck under the keyboard in such a way that she simply can t pull it out, even with a pair of needle-nose pliers What should she do to go about xing this problem UVCView is an interesting tool for observing how USB works How might this tool come in handy for diagnosing USB problems Ken has just purchased a fast new 4-gigabyte (GB) USB ash drive, complete with the latest U3 smart drive technology He plugs it into his older IBM laptop using the USB 10 ports on the system What should he expect to have happen
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Key Terms Quiz
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Use the following vocabulary terms to complete the sentences that follow Not all terms will be used
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driver full speed Hi-Speed human interface device low speed Standard Enhanced Host Controller Standard OpenHCD Host Controller USB controller USB hub USB mass storage UVCView
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A USB keyboard or mouse would fall into the __________________ category Every USB device connects to a(n) __________________ Most USB devices need a special __________________ The three USB speeds from slowest to fastest are __________________, __________________, and __________________ Windows calls the controller for Hi-Speed USB devices a(n) __________________
Lab Exercises
Understanding Video
1501 Exploring Video Characteristics 1502 Configuring Multiple Displays Lab Analysis Test Key Terms Quiz
Copyright 2007 by The McGraw-Hill Companies Click here for terms of use
226 15: Understanding Video
Of all the output devices used with computer systems video, audio,
removable media, and printers, to name just a few video is probably the only one that will stop you in your tracks if it is not working or not con gured properly Modern computer systems provide a wealth of information regarding their components Without even opening the case, a tech can spec and con gure devices, like the video system, with simple tools provided in the operating system In this set of labs, you ll explore all of the important characteristics of the display adapter, monitor, and video drivers, using the Windows Device Manager, DirectX Diagnostic Tool, and the Display applet You ll then work with the growing practice of using multiple monitors (sometimes a projector and a laptop screen) to expand your desktop viewing area
Warning
It is critical to understand that only trained monitor technicians should remove the cover of a video monitor (or a television set, for that matter) The inside of a traditional monitor might look similar to the interior of a PC, with printed circuit boards and related components, but there s a big difference: No PC has voltages up to 50,000 volts or more inside, but most cathode ray tube (CRT) monitors do So be sure to get one thing clear casually opening a monitor and snooping around has the potential to become harmful to you and the monitor and in cases of extreme carelessness, it can even be deadly! Even when the power is disconnected, certain components (capacitors) still retain substantial levels of voltage for an extended period of time Capacitors work like batteries Yes, they can maintain 50,000 volts! If you inadvertently short one of the capacitors, a large discharge will occur into the monitor circuits, destroying them If you re touching the metal frame, you could fry yourself to death Given this risk, certain aspects of monitor repair fall outside the necessary skill set for a standard PC support person, and definitely outside the CompTIA A+ certification exam objectives Make sure you understand the problems you can fix safely and the ones you need to hand over to a qualified electronics repair shop
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